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Intangible Assets - Remaining Amortization Expenses for Intangible Assets with Definite Lives (Details) - USD ($)
$ in Millions
Apr. 30, 2020
Oct. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2020 $ 67.4  
2020 134.6  
2021 132.7  
2022 130.5  
2023 126.2  
Thereafter 737.4  
Intangible assets with definite lives, net $ 1,328.8 $ 1,396.4